Elastic-fluid turbine.



W f F G. BELLUZZO.

I ELASTIC FLUID TURBINE.

APPLICATION FILED JUNE 18, 1906.

Patented Aug. 24, 1909.

GIUSEPPE BELLUZZO, OF MILAN, ITALY.

ELASTIC-FLUID TURBINE.

Application filed June 18, 1906.

To all whom it may concern:

Be it known that I, Giusnrrn BELLUZZO, mechanical engineer, a subject of the King of Italy, residing at Milan, Italy, have invented certain new and useful Improvements in ReversingG-ear Elastic-Fluid Turbines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The arrangement, which is the object of the present invention, is supposed in the ac companying diagrammatic view to be applied to the variable speed turbine, for which a U. S. atent was applied for on May 8th, 1906 (Serial Number 315,758), and in which the motive fluid may be led off from the turbine at intermediate stages to vary the speed, but the present invention refers to the means for reversing steam or other elastic fluid turbines, independently of Cit the means whereby the changes of speed are obtained according to said former application.

A preferred embodiment of the invention as hereinafter more fully described, and as particularly pointed out in the claims, is illustrated in the accompanying drawing, in which- Figure 1 is a vertical section through portions of such a turbine; Fig. 2 is an elevation of one of the blades; Fig. 3 is a section on the line rc y of Fig. 2; and Fig. 4 is a section on the line wz of Fig. 2.

Here, as in the former case, the inlet for the forward movement is at the left, the motive fluid passing through the turbine from left to right, while the inlet for the re verse movement is at the right, the course of the motive fluid being from right to left, but while the reversing might be obtained, according to said former invention, by employing the last one or the last and the last but one of the running wheels, namely 1",, r both the special reversing wheel or wheels, resorted to in said former application and the special turbines employed by other makers for the same purpose, are dispensed with, according to the present invention as the aim is attained only by giving the said wheels 7;, r the special shape shown in the accompanying drawings.

The blades pertaining to the wheels r 1', have the form shown on an enlarged scale Fig. 2 and they are so shaped that the sec- Specification of Letters Patent.

Serial No. 322,336.

tions along so y (Fig. 4) and those along w 2 (Fig. 3) are curved in opposite directions one with respect to the other. It ensues therefrom that the central part of the blade may act while the turbine is running in its normal direction, while the external part thereof is to be resorted to, only when the running direction is to be reversed. While the turbine is running backward, the steam is conveyed to the efficient part of the blade by a first guide or stationary wheel D as well as by intermediate guide wheels (Z if necessary, and escapes into the chamber a which is in communication with the condenser. The guide wheel D, as well as the intermediate guide wheel d only extend to a small part of the whole periphery of the wheels.

Now what I claim is:

1. In an elastic fluid turbine, a plurality of running wheels, the last stages only formed each of a running wheel provided with one piece vanes each having two isolated compartments with faces of opposite curvature forming work passages through the turbine, the inner and outer passages gradually increasing in capacity in opposite directions axially of the turbine, and a motive fluid supply to the smaller extremity of each passage.

2. In an elastic fluid turbine, the combination,with stationary guide wheels, of a plurality of interspersed running wheels provided with one-piece vanes, the running wheels forming the latter stages only each having two isolated compartments with faces of opposite curvature forming with the cooperating guide wheels two work passages at unequal distances from the turbine axis, each passage gradually increasing in capacity in opposite directions axially of the turbine, and a motive fluid supply to the smaller extremity of each passage on opposite sides of the turbine transversely.

3. A multistage elastic fluid turbine com prising a plurality of stationary guide wheels and interspersed running wheels, the wheels of the latter stages provided with vanes having two faces of opposite curvature forming with the cooperating guide wheels two work passages at unequal radial distances from the turbine axis, the inner passage extending throughout the turbine from the first to the last stage and serving to drive the turbine forward, and the outer passage extending through the latter stages only and serving to drive the turbine in its reverse direction, and

Patented Aug. 24, 1909.

a motive fluid supply to the extremity of each passage on opposite sides of the turbine 4. A multistage elastic fluid turbine comprising a plurality of stationary guide wheels and interspersed running wheels, the wheels of the latter stages provided with vanes having two faces of opposite curvature forming with the cooperating guide wheels two work passages at unequal radial distances from the turbine axis, the inner passage extending throughout the turbine from the first to the last stage and serving to drive the turbine forward, and the outer passage extending through the latter stages only and serving to drive the turbine in its reverse direction, each passage gradually increasing in capacity in opposite directions axially of the turbine, and a motive fluid supply to the smaller extremity of each passage on opposite sides of the turbine transversely.

5. A multistage elastic fluid variable speed turbine comprising a plurality of running wheels, and means to supply motive fluid in a forward direction to a portion or all of such wheels to increase or reduce the speed, in combination with means to supply motive fluid in an opposite direction to those wheels only which are utilized at low speeds.

6. A multistage elastic fluid variable spee turbine comprising a plurality of running wheels carrying vanes, and means to supply motive fluid in a forward direction to a portion only of such wheels at high speeds and to all of such wheels at a low speed, in combination with a series of vanes of opposite curvature carried by the low speed wheels only, and means to supply motive fluid in a reverse direction to the last named vanes to reverse the motion.

In testimony whereof I affix my signature to this specification, in the presence of two witnesses.

GIUSEPPE BELLUZZO. \[L. s.]

WVitnesses:

B. CARLO SALVOTTI, ERNEST SANTI. 

